State Treatment of Out of State Persons

Is each of the States in the United States permitted to favor its own citizens over citizens of the other 49 States?

The 14th Amendment to the U.S. Constitution states "[n]o State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States" but I'm not sure how that is interpreted.

That was all settled when the constitution was ratified. Article IV, Section 1, reads, in part: The Citizens of each State shall be entitled to all Privileges and Immunities of Citizens in the several States. I know you love to argue, usually pointlessly, so I shall have nothing more to say.